The muscle of the team, Kori'andr, aka Starfire is one of the more...unique personalities of the Teen Titans, and we wouldn't have her any other way.
Her arrival on the team was the most...uh...troublesome, as she escaped captivity and crashlanded on Earth. But once she met with Robin and the others, she eventually lowered her guard and joined the team. Starfire is quite eccentric, and is very eager to please. Which makes her funny, but also very annoying. And when she feels betrayed, she's one to hold a grudge.
But beneath it all is a girl who just wants to be accepted, both as a friend, as a hero, and as a being. She was bullied by her sister Blackfire constantly, and thus she wants to cut ties with that past life.
In battle, Starfire is a powerhouse, using her incredible strength, flight, and starbolts to take out foes. She make not look it, but this girl will knock you out easily.